CStone Pharmaceuticals announced that the board of directors Mr. Yanling Cao has been appointed as a non-executive director and a member of the nomination committee of the Company with effect from May 15, 2019. The Board has also received the letter of resignation from Mr. Xiaomeng Tong to resign as a non-executive director and a member of the Nomination Committee with effect from the Effective Date. The Board announced that Mr. Cao has been appointed as a non-executive director and a member of the Nomination Committee with effect from May 15, 2019. Mr. Yanling Cao was a director of the Company from April 1, 2016 to March 27, 2017.